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Public Module CoordConsts
    ' 定义常见的基准面
    Public ReadOnly WGS84Datum As New Datum(6378137.0, 1 / 298.257223563)
    Public ReadOnly BeiJing54Datum As New Datum(6378245.0, 1 / 298.3)
    Public ReadOnly XiAn80Datum As New Datum(6378140.0, 1 / 298.257)
    Public ReadOnly CGC2000Datum As New Datum(6378137.0, 1 / 298.257222101)
End Module
